KR102370708B1 - Damping force controlling shock absorber - Google Patents

Abstract

The damping force variable shock absorber according to the present invention includes a piston rod that performs compression and tension strokes inside a cylinder, and is coupled to the piston rod to divide the inside of the cylinder into a compression chamber and a tension chamber, and a main flow passage is formed through vertical In the damping force variable shock absorber having a piston to be used and a solenoid valve for raising and lowering a spool by magnetic force between the piston rod and the piston, each coupled to the upper and lower surfaces of the piston, and a connection passage communicating with the main passage A housing comprising: a retainer vertically penetrating; A pilot valve that is in close contact with the connection flow path between the retainers and the housings to generate a main damping force, and a spool that is through-coupled to the retainers, the housings, and the pilot valve to surround the outside of the spool a guide, wherein the pilot valve has a slit penetrating vertically so that the fluid through the connection passage and the back pressure chamber is discharged to the outside in hard mode, and the spool guide connects the slit and the back pressure chamber in soft mode A bypass passage is formed so that the passing fluid is discharged to the outside through the inside and the valve passage.

Description

Damping force variable shock absorber {DAMPING FORCE CONTROLLING SHOCK ABSORBER}

The present invention relates to a damping force variable shock absorber, and more particularly, a hard flow path can be formed through the combination of slit disks, and a soft damping force using four passages formed in the compression and tension stroke directions of the spool guide. By generating , it is possible to simplify the structure of the flow path, thereby reducing the mass-production distribution of the device and relates to a damping force variable shock absorber damping force variable shock absorber capable of increasing manufacturability.

In general, the shock absorber is installed in a moving means such as a vehicle, and absorbs and buffers vibrations or shocks received from the road surface during driving to improve riding comfort.

The shock absorber includes a cylinder and a piston rod installed so as to be compressible and expandable in the cylinder, and these cylinders and the piston rod are respectively installed on a vehicle body or a wheel or axle.

When the damping force is set low, the shock absorber can absorb vibrations caused by the unevenness of the road surface during driving to improve riding comfort. .

Therefore, a damping force variable shock absorber that can appropriately adjust damping force characteristics to improve ride comfort and steering stability according to road surface and driving conditions has been developed by mounting a damping force variable valve on one side of the shock absorber to appropriately adjust damping force characteristics. became

Such a conventional variable damping force shock absorber has a structure for selecting a hard flow path and a soft flow path by selectively opening and closing a plurality of flow paths formed in the spool guide through variable position of most of the spools.

That is, by selectively controlling the opening and closing states of the hard and soft passages formed in the spool guide, it is possible to selectively generate a hard damping force or a soft damping force.

However, since the conventional damping force variable shock absorber forms a hard flow path and a soft flow path individually using a plurality of flow paths formed in the spool guide, the structure of the device is complex and dispersion may occur during mass production, and the manufacturing cost is due to the complexity of the structure had the disadvantage of rising.

As a prior document related to the present invention, there is Republic of Korea Patent Publication No. 1998-0002962 (March 30, 1998), the prior document discloses a damping force variable buffer valve.

It is an object of the present invention to form a hard flow path through the combination of disks with slits, and to generate a soft damping force using four passages formed in the compression and tension stroke directions of the spool guide, thereby simplifying the structure of the flow path. It is to provide a damping force variable shock absorber that can reduce the mass-production distribution of the device and increase manufacturability.

The damping force variable shock absorber according to the present invention includes a piston rod that performs compression and tension strokes inside a cylinder, and is coupled to the piston rod to divide the inside of the cylinder into a compression chamber and a tension chamber, and a valve passage is formed through vertical In the damping force variable shock absorber having a piston to be used and a solenoid valve for raising and lowering a spool by magnetic force between the piston rod and the piston, each coupled to the upper and lower surfaces of the piston, and a connection passage communicating with the valve passageway A housing comprising: a retainer vertically penetrating; A pilot valve that is in close contact with the connection flow path between the retainers and the housings to generate a main damping force, and a spool that is through-coupled to the retainers, the housings, and the pilot valve to surround the outside of the spool a guide, wherein the pilot valve has a slit penetrating vertically so that the fluid through the connection passage and the back pressure chamber is discharged to the outside in hard mode, and the spool guide connects the slit and the back pressure chamber in soft mode It is characterized in that the bypass passage is formed so that the passing fluid is discharged to the outside through the inside and the valve passage.

Here, the bypass passage is formed in the direction of the compression chamber with respect to the piston, and includes a first compression passage for introducing the fluid through the back pressure chamber into the inside of the spool guide during a tensile stroke; a second compression passage for discharging the fluid through the inside of the spool guide to the valve passage to be discharged to the outside; Preferably, it is provided with a first tension passage for introducing the spool guide into the interior, and a second tension passage for draining the first tension passage and the fluid passing through the inside of the spool guide to the valve passage to be discharged to the outside.

Preferably, the second compression passage and the second tension passage are formed between the first compression passage and the first tension passage.

In addition, the pilot valves include a low disk in close contact with the connection passage in a state in which the spool guide is through-coupled, and in close contact with the low disk in a state in which the spool guide is through-coupled, along an edge spaced apart from the raw disk. A primary pilot disk having a first slit penetrating through it is formed in close contact with the primary pilot disk in a state in which the spool guide is through-coupled, and a second slit is formed along the edge to communicate with the first slit in hard mode. A third slit is formed along the edge so that the secondary pilot disk is vertically penetrating, and the spool guide is in close contact with the secondary pilot disk in a state in which the spool guide is penetrated, and communicates with the second slit and the back pressure chamber in hard mode. It is preferable that a main disk that is vertically penetrating is provided.

In addition, the first slit and the third slit are alternately formed with respect to the secondary pilot disk, and the second slit guides the fluid moved through the first slit to the side, and then to the third slit. It is preferable to guide.

In addition, a sealing member movably installed to block the back pressure chamber is further provided between the pilot valves and the housing, and the sealing member has an inlet passage so that the fluid passing through the slit moves to the back pressure chamber. is preferably formed.

In addition, auxiliary valves are respectively coupled to opposite surfaces of the housings, and the auxiliary valve is in close contact with the slit and is opened in hard mode to discharge the fluid through the slit to the outside.

The present invention can form a hard flow path through the combination of disks with slits formed therein, and generate a soft damping force using four passages formed in the compression and tension stroke directions of the spool guide, thereby simplifying the structure of the flow path. It has the effect of reducing the dispersion that may occur during mass production and increasing the manufacturability.

1 is a front cross-sectional view for showing the compression stroke state in the hard mode of the damping force variable shock absorber according to the present invention.
Figure 2 is a front cross-sectional view for showing the tensile stroke state in the hard mode of the damping force variable shock absorber according to the present invention.
Figure 3 is a front cross-sectional view for showing the compression stroke state in the soft mode of the damping force variable shock absorber according to the present invention.
Figure 4 is a front cross-sectional view for showing the state of the tension in the soft mode of the damping force variable shock absorber according to the present invention.
Figure 5 is an exploded perspective view for showing in detail each configuration of the damping force variable shock absorber according to the present invention.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

Advantages and features of the present invention, and a method of achieving the same, will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings.

However, the present invention is not limited by the embodiments disclosed below, but will be implemented in a variety of different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the art to which the present invention pertains It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims.

In addition, in the description of the present invention, when it is determined that related known techniques may obscure the gist of the present invention, detailed description thereof will be omitted.

1 is a front cross-sectional view for showing a compression stroke state in hard mode of the damping force variable shock absorber according to the present invention, and FIG. 2 is a hard mode of the damping force variable shock absorber according to the present invention. It is a front sectional view to show the state of the tensile stroke.

And, Figure 3 is a front cross-sectional view for showing the compression stroke state in the soft mode (Soft mode) of the damping force variable shock absorber according to the present invention, Figure 4 is a soft mode (Soft mode) of the damping force variable shock absorber according to the present invention mode), it is a front sectional view to show the state of the tensile stroke.

In addition, Figure 5 is an exploded perspective view for showing in detail each configuration of the damping force variable shock absorber according to the present invention.

1 to 5 , the damping force variable shock absorber according to the present invention includes a cylinder 10 , a piston rod (not shown), a piston 20 , and a solenoid valve 30 .

In addition, the damping force variable shock absorber according to the present invention includes a pair of retainers (retainer, 100), a pair of housing (200), a pair of pilot valves (300), and a spool guide (400) .

Among the above components, the cylinder 10 is manufactured in a cylindrical shape forming a space therein, and a working fluid (oil, etc.) is filled in the cylinder 10 .

Here, the cylinder 10 is shown as a single tube (Mono tube) structure, but it is also applicable to a double tube (Twin tube) formed of two cylinders.

In addition, a separate coupling part (not shown) for connecting to the vehicle body side or the wheel side may be installed at the lower end of the cylinder 10 .

As described above, one end of the cylinder 10 and the other end of the piston rod may perform compression and tension strokes in a state in which they are respectively connected to the vehicle body side or the wheel side.

One end of the piston rod is coupled to the piston 20 , and the other end of the piston rod extends to the outside of the cylinder 10 and is connected to the vehicle body side or the wheel side.

The piston 20 divides the inside of the cylinder 10 into a lower compression chamber 11 and an upper tension chamber 12, and a valve flow path 21 penetrates vertically in the piston 20. do.

The valve flow path 21 is for compression for moving the fluid of the compression chamber 11 to the tension chamber 12 during the compression stroke, and for moving the fluid from the tension chamber 12 to the compression chamber 11 during the tension stroke. Separated for each seal.

The solenoid valve 30 selectively opens and closes the hard flow path P and the soft flow path B by elevating the spool 31 in a state coupled to the piston rod located inside the cylinder 10 .

For this purpose, the solenoid valve 30 may be provided with an operating chamber in which the spool 31 is installed so as to be liftable, and a coil wound outside the operation chamber.

The coil raises and lowers the spool 31 in a soft mode or a hard mode by forming a magnetic force by the power supplied from the outside.

The pair of retainers 100 are respectively coupled to upper and lower surfaces of the piston 20 , and a connection passage 110 communicating with the valve passage 21 is formed vertically through the retainers 100 .

The connection flow path 110 is for compression for moving the fluid of the compression chamber 11 to the tension chamber 12 during the compression stroke, and for moving the fluid from the tension chamber 12 to the compression chamber 11 during the tension stroke. Separated for each seal.

A pair of housings 200 are respectively disposed on opposite surfaces of the retainers 100 , and a pilot chamber 210 is formed on the corresponding surfaces of the housings 200 .

The back pressure chamber 210 is opened toward the retainer 100 , and the back pressure chamber 210 is formed in a state in which an open portion is blocked by a sealing member 500 to be described later.

In addition, the back pressure flow path 220 for moving the fluid of the back pressure chamber 210 to the compression chamber 11 or the tension chamber 12 is formed vertically through the housings 200 .

In addition, auxiliary valves 230 may be respectively coupled to opposite surfaces of the housings 200 , and the auxiliary valve 230 may be provided with a plurality of auxiliary disks in close contact with the back pressure flow path 220 . .

The auxiliary valve 230 may be opened in the hard mode to discharge the fluid through the back pressure flow path 220 to the compression chamber 11 or the tension chamber 12 .

The pilot valve 300 is in close contact with the connection flow path 110 between the retainers 100 and the housings 200 , and the pilot valve 300 is in close contact with the connection flow path 110 in the hard mode. Slits are formed vertically through the back pressure chamber 210 so that the fluid is discharged to the outside.

In more detail, the pilot valves 300 may include a raw disk 310 , a primary pilot disk 320 , a secondary pilot disk 330 , and a main disk 340 .

One or more of the raw disks 310 may be installed, and the raw disks 310 are in close contact with the connection flow path 110 in a state in which a spool guide 400 to be described later is through-coupled.

Here, the raw disk 310 may have a disk shape in which a hollow is formed in the center so that a spool guide 400 to be described later can be coupled therethrough.

The primary pilot disk 320 is closely positioned on one surface of the raw disk 310 in a state in which a spool guide 400 to be described later is through-coupled.

Here, the primary pilot disk 320 may have a disk shape in which a hollow is formed in the center so that a spool guide 400 to be described later can be coupled therethrough.

In addition, the edge of the primary pilot disk 320 is spaced apart from one surface of the raw disk 310 .

In addition, a plurality of first slits 321 are vertically penetrating along the edge of the primary pilot disk 320 .

The first slit 321 may be formed to have a length along the circumferential direction of the primary pilot disk 320 .

To this end, a spacing disk 311 may be further provided between the raw disk 310 and the primary pilot disk 320 .

The secondary pilot disk 330 is in close contact with one surface of the primary pilot disk 320 in a state in which a spool guide 400 to be described later is through-coupled.

Here, the secondary pilot disk 330 may have a disk shape in which a hollow is formed in the center so that a spool guide 400 to be described later can be coupled therethrough.

In addition, in the secondary pilot disk 330, second slits 331 are vertically penetrating along the circumferential direction so as to communicate with the first slit 321 in the hard mode.

In addition, the second slit 331 may be formed to have a length along the center direction of the secondary pilot disk 330 .

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In this case, two cutouts 332 having a greater width than the central portion may be formed at both ends of the second slit 331 in the longitudinal direction.

Among the cutouts 332 , the cutout 332 located in the edge direction of the secondary pilot disk 330 receives fluid from the first slit 321 .

On the other hand, the cutout 332 located in the center direction of the secondary pilot disk 330 discharges the fluid transferred from the first slit 321 downward.
The second slit 331 receives the fluid from the first slit 321 through the cutout 332 and guides it laterally to a third slit 341 to be described later.

The secondary pilot disk 330 can variably control the amount of fluid moved to the back pressure chamber 210 by adjusting the width of the second slit 331 .

The main disk 340 may be installed in one or a plurality, and a spool guide 400 to be described later is in close contact with one surface of the secondary pilot disk 330 in a state in which it is penetrated and coupled.

Here, the main disk 340 may have a disk shape with a hollow in the center so that a spool guide 400 to be described later can be coupled therethrough, and the main disk 340 is the same as the secondary pilot disk 330 . can have a diameter.

In addition, the main disk 340 has a third slit 341 vertically penetrating along the edge to communicate with the second slit 331 and the back pressure chamber 210 in the hard mode.

Here, the third slit 341 may be formed to have a length along the circumferential direction of the main disk 340 .

In addition, the first slit 321 and the third slit 341 may be alternately formed with respect to the secondary pilot disk 330 .

The spool guide 400 is coupled through the retainers 100 , the housings 200 , and the pilot valve 300 , and guides the spool 31 while surrounding the outside.

Here, a hollow 401 is vertically formed inside the spool guide 400 so that the spool 31 can slide.

In addition, in the spool guide 400 , the fluid through the first to third slits 321 , 331 , 341 and the back pressure chamber 210 is provided in the soft mode through the inside and the valve passage 21 . Bypass passages 410, 420, 430, and 440 are formed to be discharged to the outside.

The bypass passage has a total of four flow passages formed therein, and includes a first compression passage 410 , a second compression passage 420 , a first tension passage 430 , and a second tension passage 440 . can be provided.

The first compression passage 410 is formed horizontally through the spool guide 400 and is formed in the compression chamber 11 direction with respect to the piston 20 .

The first compression passage 410 as described above introduces the fluid through the back pressure chamber 210 into the hollow inside of the spool guide 400 during the tension stroke.

The second compression passage 420 is formed horizontally through the spool guide 400 , and flows the fluid through the first compression passage 410 and the inside of the spool guide 400 to the valve passage 21 to the outside. to be expelled.

The second compression passage 420 is formed to be spaced apart between the first compression passage 410 and the first tension passage 430 to be described later.

The first tension passage 430 is formed horizontally through the spool guide 400 , and is formed in the tension chamber 12 direction with respect to the piston 20 .

The first tension passage 430 introduces the fluid through the back pressure chamber 210 into the inside of the spool guide 400 during the compression stroke.

The second tension passage 440 is formed horizontally through the spool guide 400 , and flows the fluid through the first tension passage 430 and the inside of the spool guide 400 to the valve passage 21 to the outside. to be expelled.

Here, the second tension passage 440 is formed between the first compression passage 410 and the first tension passage 430 described above.

Meanwhile, between the pilot valves 300 and the housings 200 , a sealing member 500 movably installed to block the back pressure chamber 210 is further provided.

Here, the sealing member 500 may be installed in a state in which the edge portion is in close contact with the side surface of the back pressure chamber 210 .

In addition, an inflow passage 510 is formed in the sealing member 500 so that the fluid through the first to third slits 321 , 331 , 341 moves to the back pressure chamber 210 .

The inlet passage 510 allows the fluid through the third slit 341 to move to the back pressure chamber 210 in the hard mode.

Hereinafter, the operation of the damping force variable shock absorber according to the present invention will be described with reference to FIGS. 1 to 4 .

First, when the solenoid valve 30 performs post-compression and tension strokes while operating in hard mode, the fluid moves through the main flow path M and the hard flow path P as in FIGS. 1 and 2 . do.

In more detail, the fluid of the compression chamber 11 or the tension chamber 12 is introduced through the valve passage 21 of the piston 20 .

Thereafter, it is discharged to the compression chamber 11 or the tension chamber 12 through the connection flow path 110 , and in this process, the pilot valve 300 in close contact with the discharge direction of the connection flow path 110 is opened to generate a damping force.

At the same time, the fluid flowing into the valve flow path 21 passes through the connection flow path 110 , the first slit 321 , the second slit 331 , the third slit 341 , and the inlet passage 510 into the back pressure chamber ( 210) is introduced.

Thereafter, the fluid introduced into the back pressure chamber 210 is discharged to the compression chamber 11 or the tension chamber 12 through the back pressure flow path 220 , and in this process, the auxiliary valve 230 is in close contact with the back pressure flow path 220 . ) opens and a damping force is generated.

On the other hand, first, when the solenoid valve 30 performs post-compression and tension strokes while operating in the soft mode, the fluid flows through the main flow path M and the soft flow path B as in FIGS. 3 and 4 . is moved

In more detail, the fluid of the compression chamber 11 or the tension chamber 12 is introduced through the valve passage 21 of the piston 20 .

Thereafter, it is discharged to the compression chamber 11 or the tension chamber 12 through the connection flow path 110 , and in this process, the pilot valve 300 in close contact with the discharge side of the connection flow path 110 is opened to generate a damping force.

At the same time, the fluid flowing into the valve flow path 21 passes through the connection flow path 110 , the first slit 321 , the second slit 331 , the third slit 341 , and the inlet passage 510 into the back pressure chamber ( 210) is introduced.

Then, the fluid introduced into the back pressure chamber 210 moves to the side, and then flows into the hollow 401 of the spool guide 400 through the first compression passage 410 or the first tension passage 430 .

Thereafter, the fluid introduced into the hollow 401 of the spool guide 400 is discharged to the second compression passage 420 or the second tension passage 440 and then compressed through the valve passage 21 in the compression and tension direction. It is discharged into the chamber 11 or the tension chamber 12 .

As a result, in the present invention, the hard flow path P can be formed through the combination of the disks with the slits formed, and the soft flow path B is formed using the four passages formed in the compression and tension stroke directions of the spool guide 400 . By doing so, it is possible to simplify the structure of the flow path, thereby reducing the mass-production distribution of the device and improving the manufacturability.

Although specific embodiments of the damping force variable shock absorber according to the present invention have been described so far, it is apparent that various implementation modifications are possible within the limits that do not depart from the scope of the present invention.

Therefore, the scope of the present invention should not be conveyed limited to the described embodiments, and should be defined by not only the claims described below, but also the claims and equivalents.

That is, it should be understood that the above-described embodiment is illustrative in all respects and not restrictive, and the scope of the present invention is indicated by the claims to be described later rather than the detailed description, and the meaning and scope of the claims; All changes or modifications derived from the concept of equivalents thereof should be construed as being included in the scope of the present invention.

10: cylinder 11: compression chamber
12: tension chamber 20: piston
21: valve flow path 30: solenoid valve
31: spool 100: retainer
110: connection flow path 200: housing
210: back pressure chamber 220: back pressure flow path
230: auxiliary valve 300: pilot valve
310: raw disk 311: gap disk
320: primary pilot disk 321: first slit
330: secondary pilot disk 331: second slit
332: cutout 340: main disk
341: third slit 400: spool guide
401: hollow 410: first compression passage
420: second compression passage 430: first tension passage
440: second tension passage 500: sealing member
510: inlet passage M: main flow path
P: hard euro B: soft euro

Claims (7)

A piston rod performing compression and tension stroke inside the cylinder, a piston coupled to the piston rod to divide the inside of the cylinder into a compression chamber and a tension chamber, and a valve passage through which the valve flow passage is vertically penetrating, and the piston rod and the piston In the damping force variable shock absorber having a solenoid valve that raises and lowers the spool by magnetic force between them,
Retainers each coupled to the upper and lower surfaces of the piston and having a connection flow passage in direct contact with the valve flow passage pass through the upper and lower surfaces, respectively, disposed on opposite surfaces of the retainers to form a back pressure chamber on the corresponding surfaces of the retainers, a housing in which a back pressure flow passage for communicating with the back pressure chamber and the outside is formed vertically through the housing; a pilot valve in close contact with the connection flow passage between the retainers and the housings to generate a main damping force; and a spool guide coupled through the housings and the pilot valve to guide the spool in a state surrounding the outside of the spool,
It is provided so that the fluid flows through only the valve flow path and the connection flow path during the compression and tension strokes of the piston rod,
The pilot valve has a slit penetrating vertically so that the fluid through the connection passage and the back pressure chamber is discharged to the outside in the hard mode, and the spool guide has a fluid through the slit and the back pressure chamber in the soft mode. Damping force variable shock absorber, characterized in that the bypass passage is formed to be discharged to the outside through the valve passage.
The method according to claim 1,
The bypass passage is
a first compression passage formed in the direction of the compression chamber with respect to the piston and for introducing the fluid through the back pressure chamber into the inside of the spool guide during a tension stroke;
a second compression passage for discharging the fluid through the first compression passage and the inside of the spool guide to the valve passage to be discharged to the outside;
a first tension passage formed in the direction of the tension chamber with respect to the piston and for introducing the fluid through the back pressure chamber into the inside of the spool guide during a compression stroke;
The variable damping force shock absorber, characterized in that provided as a second tension passage for discharging the first tension passage and the fluid passing through the inside of the spool guide to the valve passage to the outside.
3. The method according to claim 2,
The second compression passage and the second tension passage,
Damping force variable shock absorber, characterized in that formed between the first compression passage and the first tension passage.
The method according to claim 1,
The pilot valves are
a low disk in close contact with the connection passage in a state in which the spool guide is coupled through;
a primary pilot disk in which the spool guide is in close contact with the raw disk in a state in which the spool guide is penetrated and the first slit is vertically penetrating along an edge spaced apart from the raw disk;
a secondary pilot disc in which the spool guide is in close contact with the primary pilot disc in a state in which the spool guide is penetrated, and a second slit penetrates vertically along an edge to communicate with the first slit in hard mode;
A main disk in which the spool guide is in close contact with the secondary pilot disk in a state in which the spool guide is through-coupled, and in which a third slit penetrates vertically along the edge to communicate with the second slit and the back pressure chamber in hard mode is provided Variable damping force shock absorber.
5. The method according to claim 4,
The first slit and the third slit are
It is formed to be staggered with respect to the secondary pilot disk,
The second slit is
After guiding the fluid moved through the first slit laterally, the damping force variable shock absorber, characterized in that guiding to the third slit.
The method according to claim 1,
Between the pilot valves and the housing,
A sealing member movably installed in a state of blocking the back pressure chamber is further provided,
In the sealing member,
Damping force variable shock absorber, characterized in that the inlet passage is formed so that the fluid through the slit moves to the back pressure chamber.
The method according to claim 1,
On corresponding opposite surfaces of the housings,
Auxiliary valves are respectively coupled,
The auxiliary valve is
A damping force variable shock absorber, which is closely attached to the slit and is opened in hard mode to discharge the fluid through the slit to the outside.

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